<?php
    // +----------------------------------------------------------------------
    // | ThinkPHP [ WE CAN DO IT JUST THINK ]
    // +----------------------------------------------------------------------
    // | Copyright (c) 2006~2017 http://thinkphp.cn All rights reserved.
    // +----------------------------------------------------------------------
    // | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
    // +----------------------------------------------------------------------
    // | Author: liu21st <liu21st@gmail.com>
    // +----------------------------------------------------------------------
    namespace think;
    class Hook {
        private static $tags = [];

        /**
         * 批量导入插件
         * @param array   $tags      插件信息
         * @param boolean $recursive 是否递归合并
         */
        public static function import(array $tags, $recursive = true) {
            if ($recursive) {
                foreach ($tags as $tag => $behavior) {
                    self::add($tag, $behavior);
                }
            } else {
                self::$tags = $tags + self::$tags;
            }
        }

        /**
         * 动态添加行为扩展到某个标签
         * @param string $tag      标签名称
         * @param mixed  $behavior 行为名称
         * @param bool   $first    是否放到开头执行
         * @return void
         */
        public static function add($tag, $behavior, $first = false) {
            isset(self::$tags[$tag]) || self::$tags[$tag] = [];
            if (is_array($behavior) && !is_callable($behavior)) {
                if (!array_key_exists('_overlay', $behavior) || !$behavior['_overlay']) {
                    unset($behavior['_overlay']);
                    self::$tags[$tag] = array_merge(self::$tags[$tag], $behavior);
                } else {
                    unset($behavior['_overlay']);
                    self::$tags[$tag] = $behavior;
                }
            } elseif ($first) {
                array_unshift(self::$tags[$tag], $behavior);
            } else {
                self::$tags[$tag][] = $behavior;
            }
        }

        /**
         * 监听标签的行为
         * @param string $tag    标签名称
         * @param mixed  $params 传入参数
         * @param mixed  $extra  额外参数
         * @param bool   $once   只获取一个有效返回值
         * @return mixed
         */
        public static function listen($tag, &$params = null, $extra = null, $once = false) {
            $results = [];
            $tags    = static::get($tag);
            foreach ($tags as $key => $name) {
                $results[$key] = self::exec($name, $tag, $params, $extra);
                if (false === $results[$key]) {
                    // 如果返回false 则中断行为执行
                    break;
                } elseif (!is_null($results[$key]) && $once) {
                    break;
                }
            }
            return $once ? end($results) : $results;
        }

        /**
         * 获取插件信息
         * @param string $tag 插件位置 留空获取全部
         * @return array
         */
        public static function get($tag = '') {
            if (empty($tag)) {
                //获取全部的插件信息
                return self::$tags;
            } else {
                return array_key_exists($tag, self::$tags) ? self::$tags[$tag] : [];
            }
        }

        /**
         * 执行某个行为
         * @param mixed  $class  要执行的行为
         * @param string $tag    方法名（标签名）
         * @param Mixed  $params 传人的参数
         * @param mixed  $extra  额外参数
         * @return mixed
         */
        public static function exec($class, $tag = '', &$params = null, $extra = null) {
            App::$debug && Debug::remark('behavior_start', 'time');
            $method = Loader::parseName($tag, 1, false);
            if ($class instanceof \Closure) {
                $result = call_user_func_array($class, [
                                                         & $params,
                                                         $extra
                                                     ]
                );
                $class  = 'Closure';
            } elseif (is_array($class)) {
                list($class, $method) = $class;
                $result = (new $class())->$method($params, $extra);
                $class  = $class . '->' . $method;
            } elseif (is_object($class)) {
                $result = $class->$method($params, $extra);
                $class  = get_class($class);
            } elseif (strpos($class, '::')) {
                $result = call_user_func_array($class, [
                                                         & $params,
                                                         $extra
                                                     ]
                );
            } else {
                $obj    = new $class();
                $method = ($tag && is_callable([
                                                   $obj,
                                                   $method
                                               ]
                    )) ? $method : 'run';
                $result = $obj->$method($params, $extra);
            }
            if (App::$debug) {
                Debug::remark('behavior_end', 'time');
                Log::record('[ BEHAVIOR ] Run ' . $class . ' @' . $tag . ' [ RunTime:' . Debug::getRangeTime('behavior_start', 'behavior_end') . 's ]', 'info');
            }
            return $result;
        }
    }
